持续荷载下预应力纤维增强复合材料筋混凝土梁变形性能研究进展  

A State-of-the-Art Review on Deformation Performance of Concrete Beams Prestressed with FRP Tendons Under Sustained Loading

作　　者：严大威 薛伟辰[1] 江佳斐 YAN Dawei;XUE Weichen;JIANG Jiafei(College of Civil Engineering,Tongji University,Shanghai 200092,China)

机构地区：[1]同济大学土木工程学院,上海200092

出　　处：《工业建筑》2024年第6期1-12,共12页Industrial Construction

基　　金：国家重点研发计划项目(2022YFB3706500);国家自然科学基金重点项目(52130806)。

摘　　要：持续荷载作用下,纤维增强复合材料(FRP)筋蠕变松弛和混凝土收缩徐变引起的过大的附加变形将影响预应力FRP筋混凝土(FRP-PC)梁的正常使用。通过对FRP-PC梁长期性能及其设计方法的最新研究进展进行综述,归纳了不同FRP筋的蠕变和松弛特性及其预测方法,总结了有关有黏结FRP-PC梁和体外FRP-PC梁的长期性能试验结果,介绍了基于按龄期调整有效模量法(AEMM)或基于积分型徐变表达式的FRP-PC梁变形性能时随有限元分析方法,以及相应的多参数分析结果,分析了FRP-PC梁长期变形的计算理论与简化设计方法。最后,对今后FRP-PC梁长期性能的研究方向进行了展望。The serviceability of FRP prestressed concrete(FRP-PC)beams under sustained loading would be affected by the excessive long-term additional deflection,which is caused by the coupled effect of creep and relaxation of FRP tendons,and shrinkage and creep of concrete.A systematic review of the research progress on the long-term performance and design methods of FRP-PC beams was carried out.Firstly,the creep and relaxation properties of FRP tendons were introduced and the prediction methods were summarized.Secondly,the relevant results related to the past 20-year-research on the experiments of long-term performance of bonded prestressed concrete beams and externally prestressed concrete beams were concluded.The time-dependent finite element analysis method based on the age-adjusted effective modulus method(AEMM)or the integral-type creep model was summarized,and the corresponding parametric results were introduced.In addition,the similarities and differences of calculation theories and the simplified methods were analyzed.Finally,the future research on the long-term performance of FRP-PC beams was suggested.

关 键 词：FRP筋 松弛蠕变 收缩徐变 长期性能 试验研究 时随有限元分析 计算理论 

分 类 号：TU377.9[建筑科学—结构工程]